376713 04: (FILE PHOTO) Astronaut Edwin E. Aldrin, Jr., lunar module pilot, descends the steps of the Lunar Module ladder July 20, 1969 as he prepares to walk on the Moon. This photograph was taken by Apollo 11 commander astronaut Neil A. Armstrong with a 70mm lunar surface camera during the Apollo 11 extravehicular activity. The 30th anniversary of the Apollo 11 Moon mission is celebrated July 20, 1999. (Photo by NASA/Newsmakers)

30th Anniversary of Apollo 11 Moon Mission

376713 01: (FILE PHOTO) Neil Armstrong steps into history July 20, 1969 by leaving the first human footprint on the surface of the moon. The 30th anniversary of the Apollo 11 Moon mission is celebrated July 20, 1999. (Photo by NASA/Newsmakers)

30th Anniversary of Apollo 11 Moon Mission

376713 16: (FILE PHOTO) One of the few photographs of Neil Armstrong on the moon shows him working on his space craft on the lunar surface. The 30th anniversary of the Apollo 11 Moon landing mission is celebrated July 20, 1999. (Photo by NASA/Newsmakers)

30th Anniversary of Apollo 11 Moon Mission

376713 18: (FILE PHOTO) With a half-Earth in the background, the Lunar Module ascent stage with Moon-walking Astronauts Neil Armstrong and Edwin Aldrin Jr. approaches for a rendezvous with the Apollo Command Module manned by Michael Collins. The Apollo 11 liftoff from the Moon came early, ending a 22-hour stay on the Moon by Armstrong and Aldrin. The 30th anniversary of the Apollo 11 Moon mission is celebrated July 20, 1999. (Photo by NASA/Newsmakers)

30th Anniversary of Apollo 11 Moon Mission

376713 20: (FILE PHOTO) The deployment of scientific experiments by Astronaut Edwin Aldrin Jr. is photographed by Astronaut Neil Armstrong. Man's first landing on the Moon occurred July 20, 1969 as Lunar Module "Eagle" touched down gently on the Sea of Tranquility on the east side of the Moon. The 30th anniversary of the Apollo 11 Moon mission is celebrated July 20, 1999. (Photo by NASA/Newsmakers)

The December 1969 Cover Of National Geographic Depicts The Famous Photograph

376713 25: (File Photo) The December 1969 Cover Of National Geographic Depicts The Famous Photograph Of Edwin E. "Buzz" Aldrin Taken By Neil Armstrong On The Surface Of The Moon. The 30Th Anniversary Of The Apollo 11 Moon Landing Mission Is Celebrated July 20, 1999. (Photo By Getty Images)

30th Anniversary Of Apollo 11 Landing On The Moon

30Th Anniversary Of Apollo 11 Landing On The Moon (10 Of 20): U.S. Navy Pararescueman Lt. Clancey Hatleberg Disinfects Apollo 11 Astronauts Neil A. Armstrong, Michael Collins And Edwin E. Aldrin Jr. After Getting Into The Life Raft During Recovery Operations Today At The Completion Of Their Successful Lunar Landing Mission. The Space Pilots Donned Biological Isolation Garments In Their Spacecraft. The Lm (Lunar Module) Landed On The Moon On July 20, 1969 And Returned To The Command Module On July 21. The Command Module Left Lunar Orbit On July 22 And Returned To Earth On July 24, 1969. Apollo 11 Splashed Down In The Pacific Ocean On 24 July 1969 At 12:50:35 P.M. Edt After A Mission Elapsed Time Of 195 Hrs, 18 Mins, 35 Secs. (Photo By Nasa/Getty Images)

The crew of Apollo 11 Michael Collins (L), Neil Ar

WASHINGTON, : The crew of Apollo 11 Michael Collins (L), Neil Armstrong (C) and Buzz Aldrin stand in front of the Apollo command module Columbia after US Vice President Al Gore awarded them the Samuel P. Langley medal 20 July, 1999 at the National Air and Space Museum in Washington, DC. Armstrong was the first man to step on the moon 30 years ago 20 July 1969 followed by Aldrin while Collins remained in the orbiting command module. AFP PHOTO/Joyce NALTCHAYAN (Photo credit should read JOYCE NALTCHAYAN/AFP/Getty Images)

US astronaut Edwin Aldrin stands on the moon 16 Ju

SPACE, IN SPACE - JULY 20: US astronaut Edwin Aldrin stands on the moon 16 July 1969 beside the deployed flag of the United States during the Apollo 11 mission. The astronaut's footprints in the soil of the moon are clearly visible in the foreground. US astronaut Neil Armstrong used a 70mm lunar surface camera in taking this picture. (Photo credit should read DSK/AFP/Getty Images)

US austronaut Neil Armstrong poses in f

Valencia, SPAIN: US austronaut Neil Armstrong poses in front of his photo during a visit to the Prince Felipe Museum, in Valencia 26 July 2005.AFP PHOTO JOSE JORDAN (Photo credit should read JOSE JORDAN/AFP/Getty Images)

First Man On Moon Recognized In NASA Ceremony

CINCINNATI - APRIL 18: Former astronaut Neil Armstrong receives the NASA Ambassadors of Exploration award April 18, 2006 in Cincinnati, Ohio. Armstrong, who in 1969 became the first person to walk on the moon as commander of the Apollo 11 mission, was honored with the award which recognizes the sacrifices and dedication of astronauts and others who were part of the Mercury, Gemini and Apollo programs. Armstrong's award will be displayed at the Cincinnati Museum Center at Union Terminal. (Photo by Bill Ingalls/NASA via Getty Images)

30th Anniversary of Apollo 11 Moon Mission

376713 23: (FILE PHOTO) A pre-launch twilight photo of the The Apollo 11 Saturn V space vehicle. It lifted off July 16, 1969 from Kennedy Space Center in Florida. The space craft was injected into lunar orbit July 19, 1969 with Astronauts Neil A. Armstrong, Michael Collins and Edwin E. Aldrin Jr. on board. The 30th anniversary of the Apollo 11 Moon landing mission is celebrated July 20, 1999. (Photo by NASA/Newsmakers)

30th Anniversary of Apollo 11 Moon Mission

376713 06: (FILE PHOTO) New York City welcomes the Apollo 11 crew in a showering of ticker tape down Broadway and Park Avenue August 13, 1969 in a parade termed as the largest in the city's history. Pictured in the lead car, from the right, are astronauts Neil A. Armstrong, commander; Michael Collins, command module pilot; and Edwin E. Aldrin Jr., lunar module pilot. The three astronauts teamed for the first manned lunar landing on July 20, 1969. The 30th anniversary of the Apollo 11 Moon mission is celebrated July 20, 1999. (Photo by NASA/Newsmakers)

30th Anniversary of Apollo 11 Moon Mission

376713 14: (FILE PHOTO) Portrait of Neil Armstrong in 1959, ten years prior to the Apollo 11 mission in which he became the first human to set foot on the moon. The 30th anniversary of the Apollo 11 Moon landing mission is celebrated July 20, 1999. (Photo by NASA/Newsmakers)

Handout portrait taken in July 1969 of US astronaut Neil Armstrong. Armstrong was the mission commander of the Apollo 11 moon landing mission on July 20, 1969. He is the first person to set foot on the Moon. (Photo credit should read /AFP/Getty Images)

U.S. President Richard Nixon (C) and vice-President Spiro Agnew (R) congratulate, 15 August 1969 in Los Angeles, U.S astronauts of the Apollo 11 lunar mission during which two of them, the first one Neil Armstrong and Edward E. Aldrin, walked on the surface of the moon. Left to right : Edward E. Aldrin, Mike Collins, Richard Nixon, Neil Armstrong and Spiro Agnew. (Photo credit should read NASA/AFP/Getty Images)

In this NASA handout picture taken in Ju

In this NASA handout picture taken in July 16, 1969, the American flag heralds the flight of Apollo 11, the first Lunar landing mission. The Apollo 11 Saturn V space vehicle lifted off with astronauts Neil A. Armstrong, Michael Collins and Buzz Aldrin, at 9:32 a.m. July 16, 1969, from Kennedy Space Center's Launch Complex. During the planned eight-day mission, Armstrong and Aldrin will descend in a lunar module to the Moon's surface while Collins orbits overhead in the Command Module. The two astronauts are to spend 22 hours on the Moon, including two and one-half hours outside the lunar module. AFP PHOTO NASA (Photo credit should read /AFP/Getty Images)

(File) Neil Armstrong Dies at 82

USS HORNET - JULY 24: In this handout photo provided by the Richard Nixon Foundation, Apollo XI astronauts Neil Armstrong, Michael Collins and Buzz Aldrin laugh with President Richard Nixon aboard the USS Hornet, July 24, 1969. The President was on hand to greet the astronauts after their splashdown in the Pacific. (Photo by Richard Nixon Foundation via Getty Images)

US-SPACE-ARMSTRONG-FILES

This picture taken on July 10, 1979 in Paris shows Neil Armstrong, US astronaut of the first lunar mission Apollo 11poseing during a TV show. Armstrong, who died on August 25, 2012 at the age of 82 from complications following heart surgery earlier this month, inspired generations to reach for the stars and etched his name next to one of the great milestones of human discovery. AFP PHOTO PIERRE GUILLAUD (Photo credit should read PIERRE GUILLAUD/AFP/GettyImages)

US-SPACE-ARMSTRONG-PEOPLE

Photo shows a plate dedicated to US astronauts Neil Armstrong, Edwin E. Aldrin and Michael Collins at Hollywood Boulevard in Hollywood, California on August 25,2012. Neil Armstrong, the first man to walk on the moon in 1969, died on August 25. Armstrong was commander of the Apollo 11 mission that made the first manned lunar landing on July 20, 1969. AFP PHOTO/JOE KLAMAR (Photo credit should read JOE KLAMAR/AFP/GettyImages)